Update: tortilla berry pie was so rad!
My skeptical husband went from calling it Ghetto Pie to saying nothing at all because he was too busy stuffing it in his mouth.
It was just a flour tortilla, some frozen berries, sugar, and corn starch. The filling firmed up perfectly, and the tortilla got all crispy around the top. Turned out super delicious!
I'm quite proud of my kitchen wing it skills right now.